Backend development with Node.js runtime and NestJS TypeScript-first framework. Modular architecture with decorators, dependency injection and full TypeScript support for building highly maintainable REST APIs, GraphQL and enterprise-grade microservices.
NestJS framework with modular architecture and decorators (@Controller, @Injectable)
Strict TypeScript with advanced types and automatic inference
Native Dependency Injection with IoC container and scopes
Controllers, Providers, Modules for clear code organization
Guards for authentication, Pipes for validation, Interceptors for transformation
TypeORM or Prisma for ORM with migrations and complex relationships
Integrated Passport.js for auth strategies (JWT, OAuth2, local)
GraphQL with code-first or schema-first approach
Microservices with transport layers (TCP, Redis, gRPC, MQTT)
Comprehensive testing (Jest, E2E, unit tests, mocking, coverage)
The most important concepts to understand this technology and ace your interviews
Node.js: Event Loop, non-blocking I/O, async/await, streams, buffers
NestJS architecture: modules, controllers, providers, decorators
Dependency Injection: providers, scopes (DEFAULT, REQUEST, TRANSIENT), custom providers
Controllers and routing: @Get, @Post, @Param, @Body, @Query, route params
Providers and services: business logic, repository pattern, service layer
Middleware, Guards, Interceptors, Pipes, ExceptionFilters (request lifecycle)
Validation with class-validator and class-transformer (DTO validation)
TypeORM: entities, relations (@OneToMany, @ManyToOne), repositories, QueryBuilder
Prisma: schema, migrations, client, relations, transactions
Authentication: Passport.js, JWT strategy, guards, role-based access control
Configuration: ConfigModule, environment variables, validation
Exception handling: HttpException, custom exceptions, filters
Testing: unit tests with Jest, E2E tests, mocking, test doubles
GraphQL: resolvers, schemas, mutations, subscriptions, DataLoader
Microservices: patterns (request-response, event-based), transporters
Performance: caching (Redis), compression, rate limiting, profiling
Logging (Winston, Pino), monitoring, Docker, deployment
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